Move crypto_helpers from sync to base

chrome/browser/sync/util/crypto_helpers.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_
-#define CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_
-#pragma once
-
-#include <string>
-#include <vector>
-
-// An object to handle calculation of MD5 sums.
-#include "base/basictypes.h"
-#include "base/md5.h"
-#include "base/port.h"
-
-class MD5Calculator {
- protected:
-  MD5Context context_;
-  std::vector<uint8> bin_digest_;
-
-  void CalcDigest();
- public:
-  MD5Calculator();
-  ~MD5Calculator();
-  void AddData(const uint8* data, int length);
-  void AddData(const char* data, int length) {
-    AddData(reinterpret_cast<const uint8*>(data), length);
-  }
-  std::string GetHexDigest();
-  const std::vector<uint8>& GetDigest();
- private:
-  DISALLOW_COPY_AND_ASSIGN(MD5Calculator);
-};
-
-void GetRandomBytes(char* output, int output_length);
-std::string Generate128BitRandomHexString();
-
-#endif  // CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_